Commit 2531c8cf authored Jul 17, 2015 by Dominik Dingel Committed by Linus Torvalds Jul 17, 2015

mm: hugetlb: allow hugepages_supported to be architecture specific



s390 has a constant hugepage size, by setting HPAGE_SHIFT we also change
e.g. the pageblock_order, which should be independent in respect to
hugepage support.

With this patch every architecture is free to define how to check
for hugepage support.

Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 41318bfe

include/linux/hugetlb.h

+8 −9

Original line number	Diff line number	Diff line
		@@ -460,15 +460,14 @@ static inline spinlock_t huge_pte_lockptr(struct hstate h,
		return &mm->page_table_lock;
		}

		static inline bool hugepages_supported(void)
		{
		#ifndef hugepages_supported
		/*
		* Some platform decide whether they support huge pages at boot
		* time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
		* there is no such support
		* time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
		* when there is no such support
		*/
		return HPAGE_SHIFT != 0;
		}
		#define hugepages_supported() (HPAGE_SHIFT != 0)
		#endif

		#else /* CONFIG_HUGETLB_PAGE */
		struct hstate {};